Releasing threading toolholder



Oct. 31, 1950 R. BEACOM RELEASING THREADING TOOLHOLDER Filed Dec. 16, 1944 i Lg -.L

' INVENTOR. R06PBeac0 Patented Oct. 31, 1950 v i RELEASING 'rBREADmo."rooLno mR Robert Beacom, Cleveland, Ohio, assignor to The.

National Acme Company,

corporation of Ohio Application December 16,1344, Serial No. sssgtjss i 5 Claims. (o1.10 '8 f V This invention relates to threading tool hold- -;'ers and particularly to that type designated as releasing threading tool holders, and is adapted to hold a tap or a die, the object of the inven- ;-tion being to provide an improved threadingi: tool holder of this type, simple'in construction rand efficient'in operation, a particular object 1 being to provide an improved releasing threading toolholder in which all complicated parts,

such as rolls, balls; etc., are eliminated, thereby verymuch simplifying the structure.

In the drawings accompanying and forming a part of this specification,

Fig. 1 is a longitudinal sectional view of this improved threading tool holder illustrating thezzr. position of the parts during the tapping operation. I Fig. 2'is a similar view illustrating the position I of the parts after the tapping operation is completed.

Fig. 3 is a cross-sectional view taken on line 33 of Fig. 1. v

2::Fig. 4 is a cross-sectional view taken on line i 4 4 of Fig.2.

54-5 of Fig. 1.'

Fi'g.'5'is a cross-sectional view taken on line Fig. 6 is an exterior view of the holder arranged for right hand threading; and

Fig. '7 is a similar view arranged for left-hand threading. 'r- "ssimilar characters of-referen'ce indicate corresponding parts in the several views.

Before explaining in detail the present imp'rovementand its mode of operation, I .desire it understood that the invention is not limited to :the details of construction and arrangement'of parts illustrated in the accompanyingtdrawings since the invention is capable'of other'embodiments, and that the phraseology employed is for the purpose of description and motor limitation.

This improved threading tool holder in the which, as is well known, comprises an indexible work spindle carrier and a sliding tool carrier and also a die or tapspindle, to which the shank 3 of this holder is fastened for rotation with'the die spindle. 1 This outer spindle 4 has an. inner housin'g'E q-(see Fig. 5) having at intervals therearoun'd slots Cleveland, Ohio, at;

or recesses 6 and this outer spindle 4 is provided I at its forward end-with clutch teeth 1 in position to cooperate with similar clutch teeth' 8 I carried by-a ring "9 threaded on the end of an inner spindle I!) carried within the outer spindle =4 and having a shank ll projecting through the bored'shank 3 of the outer spindle. On this .-shank H is a coiled spring [2 eif'ective to permit work. For left hand'threading, this is reversed,

the tap being rotated faster than the workto thread and sl'ower'to back it off but in the same In the operation lengthwise shiftable movement of the inner spindle relative to its'outer spindle, the coiled spring acting to pull back the inner spindle at a predetermined time. V The inner spindle I0 is provided with a bore l2 for the reception of threading tools such as a I tap or die which may be held therein by means ofa screw plug l3.

Carried by the inner. spindle ID are a pairof transversely extending spring-pressed pins or plungers i4 and I5, the-outer ends of which are tapered and also notched, the notch 14' of one pin and'its taper being opposite to the notch l5 and taper of the other pin: These tapered ends permit the proper rotation or retardation of the --inner spindle relative :to the-outer spindle at-a predetermined time while the notched ends'engage the inner housing 5 at the'propel time to hold back the rotation of the inner spindle when the tap is to be backed ofi the work. I

These pins l4 and I5 are held and guided in properposition by suitable guide pins 16 located in the inner spindle I0 and projecting into slots I! of thepins I4 and I5. These pins I4 and- I5 are in position to cooperate with the slots or recesses 6 of the inner housing 5 carried by the outer spindle. 1- i In practice, for right-hand threadingof the work, the threading tool when used as step is rotated on to the work at a slightly slower speed than the work but at a higher speed in the same direction to screw or back off the tap from the shown'in Fig. 7.

' of this improved threading tool hold'er when used as a tap, when the tap enters tl'ie work, the clutch teeth 1 and 8 form a driving connection between the inner spindle lfl stopped, but not its rotation, by the usual means such as a stop rod provided for the purpose and fastened to the framework of the machine. When the die or tap spindle is stopped in its forward travel, the inner spindle 10, because of its engagement with the work, is pulled forward relative to the housing of the outer spindle approximately 1 (see Fig. 2) against the action of the coil spring l2, separating the driving clutch teeth 1 and 8 and so permitting the inner spindle to rotate with the work independently of the outer spindle and until, during this-forward-;movement of the inner spindle In, the pins or plungers l4 and I5 are pressed outwardly by their springs and project into a pair of the slots 6 of the inner housing which thus again connect the inner spindle with the outer spindle whereupon when the usual clutch is shifted to rotate the die spindle at a higher speed than that ofthe work for right-hand threading, these pins or plungers Fact-as a brake and so retard the innerspindle and .thus back off or remove the tap from the work. The tap is reset by the coil spring l2 which, as soon as the tap backs ofi' or rotates free of-"the work, draw the inner spindle I back again. The meshing of the clutch teeth rotates =zthe tinner spindle, thereby compressing the rplungers or pins (4 and 15, whereupon the tap is in readinesslfor another tapping operation.

. i'Itrgzis to be understood" that by describing in detail herein any particular form, structureor arrangement, it is not intended to limit'the invention beyond the termsof the several claims "or the'requirements of the-prior art. I :Having thus explained thenature of my said invention and described a way of constructing F andJusing'the same, although without attemptzing'to set forth allot the-forms in which it may :be made or all-of the modes of its use, I claim? 1. In areleasingthreading tool holder, an outer spindle having an inner housing provided at in- "tervals therearound withrecesses, saidouter .spindle also beingprovided at its-forward end vwith replaoeableclutch teeth, an inner spindle -carried within the-outer spindle --"and"h'aving a replaceable clutch toothed ring on the end thereof engageable with the clutch teeth on the forward endof the -outer-spindle, a boredshank on said outer spindle, a shank on said inner spindle projecting through said bored shank of the outer spindle, a coil spring interengagingsaid shanks to permit and control lengthwise shiftable move- --ment of the innerspindlerelative to the outer spindle, a threading tool receiving bore in'said inner spindle, a pair of transversely extending 'spring-pressedplungers carried by said inner *"spin'd1e,=said plungersi'having their outer ends .tapered and extendable into the recesses inuthe 'inner housing, a coil spring; compressed between said plungers and tending to separate them to. project the tapered. ends thereof into the -re- 3 -cesses' when the plungers arealigned with-the :irecesses, saidiplungers,.extending' transversely of :atheshank of saidinner spindleand being po- -sitioned between thethreading tool receiving bore and the coil spring interengagingthe shanks.

2. Ina releasing threading tool-holder, an outer spindle having an inner housing provided at inter-,- vals; therearound with recesses, saidouter spindle also being providedat its forward end withclutch .teeth,,an innenspindle carried-within the outer :-spindle ;and havingia clutch toothed ring on the end: thereof engageable with the'clutch teeth 'on :.th'e1 forwardend: of v.theouter spindle, a bored :shankonsaid outersspindle, a shank on said inner spindle projecting through said bored shank oi. the outer spindle, a coil spring interengaging said shanks to permit and control lengthwise shiftable movement of the inner spindle relative to the outer spindle, a threading tool receiving bore in said inner spindle, a pair of transversely extending spring pressed plungers carried by said inner ,.spindle, said plungers having theouter ends thereof tapered and extendable into the recesses in the 10 inner housing, a coil spring compressed between said plungers and tending to separate them to project the tapered ends thereof into the recesses when the plungers are aligned with the recesses, said' plungers extending transversely of the shank 16 of said inner spindle and being positioned between the threading tool receiving bore and the coil spring interengaging the shanks.

3. In a releasing threading tool holder, an outer spindlehaving an inner housing provided at inter- 20 vals therearound Withirecesses, said outer spindle also being provided at: its fonvardiend withiclutch iteeth,:'an innerspin'dle carried'rwithin the outer spindle .:and;:having-a fillltChliiTODthEdTihE on. the .end' thereof,engageable witha'the clutch teethon the'forwardx' end of the outer spindle, a bored shank on saidiouter. spindle, ashank on said inner spindle projecting. through .said' .bored: shank of .the outer'spindle, a coil'sp'ring interengaging said shanks to permit: and control lengthwise shiftable movement "oli'the innerr'spindle relative to the outer spindle, a; threading tool" receivingibore in said'inne1"spindle';;av pair of transversely extending spring pressed plungerscarriedby said inner spindle, saidplun'gers having 'camrsurfaces'on' the outer :ien'dsgtfiereof;:extend able: into-the? recesses in: thez'inner: housing;i-to allow theainner "spindle to rotate in one direction only relative to theinner :zho'using of the? outer; i spindleya'rooil :spring compressed; between 'saidiplung'ers and tendinguto 40 separate them to project the ends thereof intothe recesses when": the pl-ungers' are aligne'diwitli: the recesses, said plungers extending transversely-of 3 the shankl of said inner: spindle; and being Lpositioned between the threading toolreciiring bore u. 1 and "the coil 3 spring .inte'rengaging the" shanks.

4. In a releasing threading tool holder, a'hollow -outer spindle; having: recesses. internally thereof and spaced at'intervalsi thereabout, a bored shank on one. end. of said: outer spindle; a replaceable drive clutch ring on the other end ofisaid'; outer spindle, an inner spindle carriediwithin.theouter spindle andahailingxzan"openingfor receiving a threading tool, a clutch ringreplacea'bly mounted on said inner spindle and; drivingly engageable with said drive.ic1utch:ring;an innershank onsaid inner spindle-extending through said bored shank of said outer'spindle, aclutchspring interengaging said shanksand tending to hold said clutch 'rings inzengagementand a pair of transversely on extending plungers'carried by said inner spindle in alignmentiwith said: recesses between said tool receiving: hole: and said shank; said transversely extending plungers' having' cam surfaces on the ends ithereof extendable into the recesses" to allow -theinner-spindle to rotate in one dire'ction only .relative to the outerspindle, a spring extending between saidyplungersl and:urging said plungers apart to projecttheplungers into the recesses when the plungers arealigned' with the recesses.

5. In a releasingthreadingtool holder, a hollow outer spindle ha'vingrecesses internally thereof and spacedv at intervals.thereabout,a bored shank on one end of said outer spindle, a replaceable drive clutch -.ring. on the othenendof said outer '75 spindle, aminner spindle carried-within the outer spindle and having an opening for receiving a threading tool, a clutch ring replaceably mounted on said inner spindle and drivingly engageable with said drive clutch ring, an inner shank on said inner spindle extending through said bored shank of said outer spindle, a clutch spring interengaging said shanks and tending to hold said clutch rings in engagement, and a pair of transversely extending plungers carried by said inner spindle in alignment with said recesses between said tool receiving hole and said shank, said plungers havinto the recesses, a spring extending between said plungers and urging said plungers apart to project the tapered ends of said plungers into the recesses when the plungers are aligned with the recesses.

ROBERT BEACOM.

-= ing the outer ends thereof tapered and extendable REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 12,269 Hunter Sept. 20, 1904 211,742 Johnston Jan. 28, 1879 976,880 Hunter Nov. 29, 1910 1,126,919 Tyson Feb. 2, 1915 1,188,437 Gates June 27, 1915 1,254,933 Peuch et a1. Jan. 29, 1918 1,290,427 Velk June 7, 1919 1,425,226 Whitman Aug. 8, 1922 1,740,887 Crosby Dec. 24, 1929 2,147,203 Kylin Feb. 14, 1939 2,287,192 Mueller June 23, 1942 2,340,477 Kruse Feb. 1, 1944 2,356,669 Hook Aug. 22, 1944 2,370,885 Sohm Mar. 6, 1945 

